DE2362016A1 - Filling machine buffer for doughy substances, esp. sausage meat - cylinder with constant pressure piston levels out pump feed - Google Patents

Abstract

A filling machine for dough substances, esp for sausage meat, has, between the pump and the delivery nozzle, buffer arrangement comprising a cylinder with a piston operating under constant press, connected to the filling pump outlet and the sausage filling nozzle inlet. On th piston rod a tappet block contacts a switch de-energising the filling pump when the buffer cylinder is almost full, and energising it when the cylinder is almost empty. The piston is operated hydraulically, or pref. pneumatically, via separately adjust able press. reducing valves. Fluctuations of press and blockages causing breakdown due to the intermittent working of known machines are eliminated.

Description

Patent attorney DIPL.-ING.BERTHOLD SCHMID STUTTGART 1 ■ FALBENHENNENSTRAS S E 17 · TELEPHONE (0711) 608893

OUR SIGN

11 211 / B / wi

Karl Schnell

7o65 Winterbach

Filling device for doughy media, in particular

for sausage meat

The invention relates to a filling device for doughy media, in particular for sausage meat, with a filling machine and a filling pump conveying into it ο the latter pumps a continuous medium · =

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power to the filling machine, which in turn works intermittently. This naturally has pressure fluctuations and congestion in the connection path between the filling pump and the filling machine. In extreme cases, the one and / or another unit may result.

The object of the present invention is now seen in to create a filling device of the type mentioned at the outset, in which such malfunctions do not occur and the risk of damage is excluded.

To solve this problem, such a filling device proposed according to the invention that a buffer device between the filling machine and the filling pump is switched. So if the filling pump delivers more than is currently being processed by the filling device can be, so this amount reaches the buffer device, XTo it can then be removed again later.

A particularly preferred embodiment of the invention is characterized in that the buffer device has a cylinder with, in particular, approximately " Has constant counterforce displaceable piston and one

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of the two cylinder spaces is connected to both the pressure side of the filling pump and the inlet of the sausage filling machine. The constant counter force causes _s that in the connection between the pump and the filling machine is always the same pressure prevails, so that a dimensionally accurate portioning is seen from this side not in question. Another embodiment of the invention is characterized in that the piston is connected to an actuating member for a switch of the filling pump drive, the switching off of the pump drive being assigned to the approximately filled cylinder and the switching on of the almost empty cylinder. The excess quantity conveyed by the filling pump and currently not to be taken up by the filling machine enters the cylinder and thereby moves the piston against the opposing force on its other side. When the cylinder is full or almost full, and the piston is, for example, in its lower end position, it actuates a switch in a mechanical or other way, which interrupts the circuit of the pump drive. Subsequently, the force constantly acting on the piston pushes the latter upwards again, the medium that has entered the buffer device or the cylinder being expelled. When the piston has reached its upper or approximately upper end position, the switch is activated again in a mechanical or other way

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moved back to its original position and thus switched on the pump drive. It is possible without further ado instead the shutdown of the pump drive via the piston movement only to open and close a coupling between pump drive and pump. The piston can do just as well act instead of an electrical switch on another switching or control device, which in the same Way, the interruption of the flow until emptying or partial emptying of the buffer cylinder. In particular, it is possible to use a pump with a variable delivery rate pneumatically, electrically, hydraulically or mechanically to set to zero delivery on the one hand and the desired delivery rate on the other. The piston could then in turn take over the adjustment directly or indirectly by opening or closing a circuit or one hydraulic or pneumatic control pressure changed.

According to a further feature of the invention, the piston is used to generate the counterforce on its doughy medium opposite side hydraulically or in particular pneumatically pressurized. The medium to be filled is for example at the top and the hydraulic or pneumatic pressure at the bottom of the piston. Unless a flying one Piston is provided, one is the pneumatic or hydraulic pressure of the cylinder side receiving the piston rod

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forward ..

Another invention material is characterized by.,. that the hydraulic or pneumatic bridge is adjustable, the pressure medium to the cylinder. Buffer device «in particular via at least one adjustable. Pressure reducing valve flows in. The latter are eineji exactly dosed koinstanten and particularly adjustable pressure from, which one always consistent ~ drag on. The buffer device piston _s guaranteed. A further development of this embodiment consists in the fact that the pressure medium, preferably compressed air, can be fed to the cylinder of the buffer device optionally via one of two adjustable, preferably electrically controllable pressure reducing valves At the same time, there is a particular advantage if the pressure reducing valves are set to different pressure values, with the one with low pressure in the filling phase of the cylinder of the buffer device and the one with low pressure in the emptying phase of the cylinder that is connected to the cylinder of the buffer device with the higher pressure. Of course, higher pressure also means greater force or counterforce on the piston of the buffer device. On the other hand, when the buffer device is emptied, its internal losses must be compensated choose that at Filling the buffer device, so at

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conveying pump and when emptying the buffer device and zero delivery of the pump at the inlet of the filling machine always the same pressure prevails- The pressure difference between the initial pressures of the two. So pressure reducing valves is so that they can overcome internal losses the buffer device is just sufficient

Another improvement of the invention is that the holder of the filling pump drive is also the switch for the pressure reducing valves, the latter being the same are designed as solenoid valves. The switch must, of course, have several pairs of contacts both working and normally closed contacts,

Another variant of the invention is characterized in that that the piston is connected on its side facing away from the medium to be filled with one end of a piston rod, the other end of which carries an auxiliary piston displaceable in the same cylinder or in an extension cylinder, wherein whose side facing away from the piston is pressurized with compressed air. Both the piston and the auxiliary piston arranged coaxially with it are opposite the cylinder or when in use of two cylinders standing in extension of one another, each sealed in their cylinder. Lubrication of the Piston is usually not necessary, at least when filling sausage meat, because it takes over the lubrication

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can. On the other hand, lubrication can be provided for the auxiliary piston, especially when it is pushed back with the aid of compressed air. The lubricant used for this must, however, under no circumstances be mixed with the filling medium. Furthermore, it is also important to prevent the pressure medium, that is to say the compressed air or the pressure oil, from entering the cylinder space filled with the filling medium. Since perfect stripping of the cylinder wall is not guaranteed 100% ± g , the last-mentioned requirement can be met by separating the piston and the auxiliary piston so far that the auxiliary piston is never moved along the part of the cylinder wall over its entire displacement range along which the piston of the buffer device slides. The cylinder space located between the piston and the auxiliary piston can, if necessary, be provided with a corresponding vent. -

Another feature of the invention is that a control rod penetrating the cylinder base in a sealing manner is arranged as an extension of the piston rod ¹ , the free end of the control rod being designed as an actuator for the switch of the filling pump drive. Approximately at the end of the downward and upward movement, the control rod swivels or displaces an actuator of the switch or an actuator between the latter and the control rod.

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switched transmission organ. The downward movement can do this a back and forth movement of the control rod a pivoting up or displacement of the switch actuator or the transmission element assigned to Tverden. - -

A particularly advantageous embodiment consists in that the free end of the control rod has a thickening, a '-' ■ - '■ approach or the like * which can be displaced back and forth between two inclined flanks of a double-armed pivot lever, the axis of the pivot lever is connected to the switch mechanism or forms part of the same.

In the drawing is an embodiment of the invention shown. Show it

Figure 1 is a vertical longitudinal center section through the filling device according to the invention,
Figure 2 shows a pneumatic control plan.

The pipeline 1 connects a filling pump, not shown, to a filling machine, also not shown. At the branch pipe 2, the cylinder 3 of a buffer device h is attached. The flange connection is designated quite generally with 5. In the cylinder 3 of the buffer device 4 is a

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Piston 6 slidable up and down in the direction of double arrow 7. He wears one that lies against the inside wall of the cylinder Sealing ring 8. A piston rod 9 is pushed into the piston 6 from below and, for example, with the aid of a Secured by Stiftes Io. The free or lower end 11 of the The piston rod 9 is inserted in an auxiliary piston 12 ', which is thereby given a coaxial position with respect to the piston 6. The auxiliary piston is in an extension cylinder 13 also in the direction of the double arrow 7 up and down. Both are mutually held by a splash connection 14. It is without further conceivable, the cylinder 3 and the extension cylinder 13 to manufacture in one piece. When manufactured separately, the inner diameter of the extension cylinder 13 can be somewhat Select larger than that of the cylinder 3, the same applies analogously to the auxiliary piston 12 and the piston 6. The cylinder base 15 is also designed to be removable via a splash connection 16, although it is also in one piece with the extension cylinder 13 or a complete cylinder could be made. He is supported by a control rod

17 penetrated, the passage by means of a ring

18 is sealed. At its free end, the control rod 17 carries one of a cylindrical center piece and two attached truncated cones existing attached approach 19, with one in the sense of the double arrow 2o around the axis 21 of a switch 22 rotatable pivot lever 23 cooperates. In Figure 1, the lower end position of the Approach 19 and thus also of the auxiliary piston 12 and the piston

6 is drawn in with solid lines, while the two switching positions of the approach ± 9 are symbolized with dash-dotted lines. The puncture of this device is described below.

If the filling pump delivers more than the filling machine can momentarily eject, the superfluous filling material escapes into the cylinder 3 and thereby moves the piston 6 downwards in the direction of the arrow 2k. The cylinder space 25 of the extension cylinder 13 or a common cylinder of the buffer device 4 according to the invention is connected to a compressed air source via a line 26. This connection is shown schematically in FIG. 2, which will be explained below. The pressure in the cylinder chamber 25 is matched to that in the pipeline 1, ie the piston 6 and the parts connected to it remain in place despite the pressure prevailing in the cylinder chamber 25 when the filling machine can fully accept the amount delivered by the filling pump. If the delivery is too strong, the piston or the entire system that can be displaced with it migrates downward in the direction of arrow 24. As soon as the extension 19 has reached the lower dot-dash position 27, it presses against the flank 28 of the pivot lever 23 and pivots it clockwise. This results in a pair of contacts in switch 22 opening, this pair of contacts interrupting the flow of current to the pump drive motor. When the pump drive motor is switched off, there is no further conveyance of the medium. But since the pressure in the cylinder

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Space 25 is maintained, and the filling machine continues to run, the pneumatic force that is caught on the auxiliary piston 12 can have an effect, which pushes out the medium that has accumulated inside the cylinder 3 via the auxiliary piston, the piston rod 9 and the piston 6 * As soon as the Approach 19 has reached the upper dash-dotted line £ gg # 29, it encounters the flank 3o of the other lever arm of the pivot lever 23 in an unä i? Wsciiw®ttkt the latter in the (Jegenuhr pointer sense * This closes the contacts of the holder again and the drive the 'pump switched on again'

When pushing the medium out of the cylinder 3, the frictional forces of ^{the piston:} 6 of the auxiliary piston 12 and the piston rod 1? On the other hand, it is important for an even portiomie that the pressure in the pipeline 1 is steady; this would automatically result in a drop in pressure in the pipe line 1, which, as I said, is undesirable. Accordingly, it is necessary that the pressure in the cylinder chamber 25 when the cylinder 3 is emptied is greater than when it is filled.

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The compressed air does not flow directly to the cylinder chamber 25, rather it is alternately directed via two pressure reducing valves 31 and 32. These are set to different pressures. In the special exemplary embodiment, an output pressure of 2.5 atmospheres is provided for the pressure reducing valve 31 and an output pressure of 3 atmospheres for the pressure reducing valve 32. Accordingly, the compressed air is supplied to the cylinder space via the pressure reducing valve 31 during the filling phase and via the pressure reducing valve 32 during the emptying phase. Both have an adjustment device 33 or 3 ^ (Fig. 2). As mentioned, these are magnetically controllable pressure reducing valves. The opening and closing of their circuits also takes place with the aid of the switch 22 and the control rod 17j, ie ultimately by the piston of the buffer device. The switch 22 must therefore still have a corresponding number of contacts in order to be able to open and close the circuits of these pressure reducing valves.

The compressed air is fed to the two pressure reducing valves 31 and 32 are supplied via the line 35, 36, the admission pressure being, for example, 6 atmospheres. A control valve 37 alternately connects the pressure reducing valve 31 and the pressure reducing valve 32 with one known per se

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Relay valve 38. The feed line is designated by 39. The switching of the control slide can also electrically via the switch 22 take place, which may have yet another pair of contacts for this purpose _o The reversal is also on others, for example, pneumatic way possible. At the same time, the form pressure (6 atmospheres) is also fed to the relay valve 38 via the line 4o. It is also connected to a 4l manometer. A connecting line 42 leads from the relay valve to the cylinder chamber 25 or the line 26 drawn in FIG. 1. The lines drawn in dash-dotted lines in FIG. 2 serve special control purposes, the details of which are not essential to the invention. They could also be omitted.

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Claims (11)

Expectations 1. Filling device for doughy media, in particular for sausage meat, with a filling machine and one in this conveying filling pump, characterized in that a buffer device (1) between the filling machine and the filling pump is switched. 2. Device according to claim 1, characterized in that the buffer device (1) has a cylinder (3) with piston 6 displaceable therein against an in particular approximately constant counterforce and one of the two cylinder spaces with both the pressure side of the filling pump and the inlet of the sausage filling machine connected is. 3. Apparatus according to claim 2, characterized in that the piston with an actuator 19 for one Switch (22) of the filling pump drive is connected, the shutdown of the pump drive being approximately filled cylinders and the activation of the almost empty cylinder are assigned. - 15 509825/0885 4. Apparatus according to claim 3, characterized in that the piston (6) to achieve the counterforce on his is pressurized hydraulically or in particular pneumatically from the doughy medium side. 5. Apparatus according to claim 4, "characterized in that the hydraulic or pneumatic pressure can be regulated, the pressure medium to the cylinder (3, 13) of the buffer device (1) flows in in particular via at least one adjustable pressure reducing valve (31, 32). 6. Apparatus according to claim 5, characterized in that the pressure medium, preferably the compressed air, can be supplied to the cylinder (3, 13) of the buffer device (1) optionally via one of two adjustable, preferably electrically controllable pressure reducing valves (31 _S 32). 7. The device according to claim 6, characterized in that the pressure reducing valves (31, 32) are set to different pressure values, the one with low pressure in the filling phase of the cylinder (3) of the buffer device (1) and the one with low pressure in the emptying phase of the cylinder (3 ) the one with higher pressure is connected to the cylinder space (25) of the buffer device. - 16 - 509825/088 5 8. Apparatus according to claim 3 and 7, characterized in that the switch (22) of the pump drive is also a changeover switch for the pressure reducing valve (31 »32), the pressure reducing valves being designed as solenoid valves. 9. Device according to one or more of claims 2 to 8, characterized in that the piston (3) at its the side facing away from the medium to be filled is connected to one end of a piston rod (9), the other end of which End (11) one in the cylinder or an extension cylinder (13) carries displaceable auxiliary piston (12), its side facing away from the piston (6) being pressurized is. 10. The device according to claim 3 and 9 » characterized in that a cylinder base (15) sealingly penetrating control rod (17) is arranged in extension of the piston rod (9), in particular the free end of the control rod as an actuating member for the switch (22) of the filling pump drive is trained . 11. The device according to claim lo, characterized in that the free end of the control rod (17) has a thickening, a projection (19) or the like. That is between two - 17 509825/088 5 inclined planks (28 or 3o) of a double-armed The pivot lever (23) can be moved back and forth, the Axis (21) of the pivot lever is connected to the switch mechanism or forms part of the same. 50982 5/0885